Controllable preparation of vertically standing graphene sheets and their wettability and supercapacitive properties

Vertically standing graphene(VSG) sheets have been fabricated by using plasma enhanced chemical vapor deposition(PECVD) method.The lateral size of VSG nanosheets could be well controlled by varying the substrate temperature.The higher temperature usually gives rise to a smaller sheet size.The wettability of VSG films was tuned between hydrophobicity and hydrophilicity by means of oxygen and hydrogen plasma treatment.The supercapacitor electrode made of VSG sheets exhibited an ideal double-layer-capacitor feature and the specific capacitance reached a value up to 9.62 F·m~(-2).     

自动顶空-气相色谱-质谱法测定血液中乙醇含量

提出了自动顶空-气相色谱-质谱联用检测血液中乙醇含量的方法。取一定量的血样或乙醇标准样品置于顶空瓶中(其中各加固定量的叔丁醇作为内标),在60℃及中速振摇的条件下平衡20 min,通过进样环定量地将一定量样品引入于气相色谱-质谱联用仪器中进行测定。乙醇和叔丁醇的保留时间分别为1.47 min和1.56 min。方法的线性范围为0.01~10.00 g.L-1,检出限(3S/N)为0.6 mg.L-1,测定下限(10S/N)为1.0 mg.L-1。乙醇的回收率在92%~105%之间,测定值的相对标准偏差(n=6)小于7%。